Accurate solar observation plays a vital role in space weather prediction. Aditya-L1, ISRO’s first solar observatory mission, carried a Visible Emission Line Coronagraph (VELC) instrument. This instrument provides observations very close to the solar limb with internal occultation. We provide design and development details of detector electronics for continuum, two spectroscopic channels and one spectro-polarimetry channel of the VELC instrument. The developed hardware with imaging detectors (sCMOS in visible and InGaAs in near-infrared spectral region) has very high sensitivity (noise equivalent signal = 0.2 photon/s/pixel). The instrument has onboard intelligence for detection of coronal mass ejection events. Photon-noise-limited detector electronics are developed and qualified for all four channels. Dark noise of ≈1.2e− with dark signal ≈0.035e−/p/s was achieved. Detector electronics cater to very high input dynamic range >120 dB. Stringent contamination control protocols were evolved and implemented during all stages of development. The uniqueness of the VELC instrument is that it makes observations very close to the solar limb (1.05 R) as well as magnetic field measurements and has simultaneous spectroscopic and imaging capability.

中文翻译：

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Aditya-L1 可见发射线日冕仪有效载荷的探测器电子设备

准确的太阳观测在空间天气预报中发挥着至关重要的作用。 Aditya-L1 是 ISRO 的第一个太阳观测站任务，携带可见发射线日冕仪 (VELC) 仪器。该仪器通过内部掩星提供非常接近太阳边缘的观测结果。我们提供 VELC 仪器的连续谱、两个光谱通道和一个光谱偏振测量通道的探测器电子器件的设计和开发细节。所开发的带有成像探测器（可见光中的 sCMOS 和近红外光谱区域中的 InGaAs）的硬件具有非常高的灵敏度（噪声等效信号 = 0.2 光子/秒/像素）。该仪器具有机载智能功能，可检测日冕物质抛射事件。光子噪声限制探测器电子器件已开发并适用于所有四个通道。暗噪声为 ≈1.2e−，暗信号为 ≈0.035e−/p/s。探测器电子器件可满足 >120 dB 的极高输入动态范围。在开发的各个阶段，制定并实施了严格的污染控制协议。 VELC 仪器的独特之处在于，它可以非常接近太阳边缘 (1.05 R) 进行观测以及磁场测量，并具有同步光谱和成像功能。